GO-Telepath

A simple library to easily communicate your go values to javascript.

Library based on Telepath for Wagtail.

Installation

go get github.com/Nigel2392/[email protected]

Usage

First we must define an adapter.

An adapter is an object used to serialize and deserialize go values to javascript.

We will also define an adapter for pure interface types.

These types are checked in the following order:

1. Check for the type in the registry itself. It will not check for interfaces.

2. Check for the type in the interfaces registry.

3. Check for the type in the defaults registry.

var AlbumAdapter = &telepath.ObjectAdapter[*Album]{
	JSConstructor: "js.funcs.Album",
	GetJSArgs: func(obj *Album) []interface{} {
		return []interface{}{obj.Name, obj.Artists}
	},
}

var ArtistAdapter = &telepath.ObjectAdapter[*Artist]{
	JSConstructor: "js.funcs.Artist",
	GetJSArgs: func(obj *Artist) []interface{} {
		return []interface{}{obj.Name}
	},
}

type Namer interface {
	GetName() string
}

var NamerAdapter = &telepath.ObjectAdapter[Namer]{
	GetJSArgs: func(obj Namer) []interface{} {
		return []interface{}{obj.GetName()}
	},
}

Then we must register the adapters.

type Album struct {
	Name    string
	Artists []*Artist
}

type Artist struct {
	Name string
}

func (a *Artist) GetName() string {
	return a.Name
}

func main() {
	telepath.Register(AlbumAdapter, &Album{})
	telepath.Register(ArtistAdapter, &Artist{})
	// Register the interface
	// It will not be used unless you remove the ArtistAdapter
	telepath.RegisterInterface(NamerAdapter, (*Namer)(nil))

	album := &Album{
		Name: "The Dark Side of the Moon",
		Artists: []*Artist{
			&Artist{Name: "Pink Floyd"},
		},
	}

	var ctx = telepath.NewContext()
	var result, err = ctx.Pack(value)
	if err != nil {
		log.Fatal(err)
	}

	b, err := json.Marshal(result)
	if err != nil {
		log.Fatal(err)
	}
	var telepathJSON = string(b)

	// Pass to JS somehow...
	// ...
}

Then we must define the javascript side.

This will deserialize the go values and create the objects.

We will create some classes to represent the go objects.

The classes must also be registered to the window.telepath object.

We do ship a telepath.js file, but it is only used for testing.

Telepath can be installed via npm.

class Album {
	constructor(name, artists) {
		this.name = name;
		this.artists = artists;
	}
}

class Artist {
	constructor(name) {
		this.name = name;
	}
}

// If you haven't already instantiated the telepath object
// window.telepath = new Telepath();

window.telepath.register("js.funcs.Album", Album);
window.telepath.register("js.funcs.Artist", Artist);

// Now you can use the go values

// Lets assume they are stored in a variable called `telepathJSON`
var telepathValue = JSON.parse(telepathJSON);

var album = telepath.unpack(telepathValue);

console.log(album);

// Output:
// Album {
//   name: 'The Dark Side of the Moon',
//   artists: [ Artist { name: 'Pink Floyd' } ]
// }